For most plans, music credit rolls into your account every month! It’s usually on the same day each month from when you purchased your plan, unless you’ve made some update to your account, gone on hold, etc. To check when you can expect your next credits:
Sign in to the eMusic website or app
Select the account icon to get to your account page
Check the details under Current Plan
There are a few cases in which members have maintained a special account from long ago that has a totally different cycle. You can find out what plan you are on in the same process above!